The unconditioned response is the feeling of tiredness
Yon, I am so tired
The neutral stimulant is the Thansgiving dinner
Every time he falls asleep without cleaning he is smacked by his wife until he gets up and helps. This is negative reinforcment
Get up! You need to help clean
This is a primary enforcement because you need sleep. This is also an immediate reinforcement because he gets smacked if he is sleeping right away. This is a fixed interval because it happens every time he falls asleep when he should be cleaning
Now the Thanksgiving dinner is the conditioned stimulus and the conditioned response is to sleep.